Insulin `(C_(2)H_(10)O_(5))_(n)` is dissolved in a suitable solvent and the osmotic pressure `(pi)` of solutions of various concentrations `(g//cm^(3))C` is measured at `20^(@)C`. The slope of a plot of `pi` against `C` is found to be `4.65 xx 10^(-3)`. The molecular weight of insulin is:
A. 3 x `10^(5)`
B. 9 x`10^(5)`
C. 4.5 x `10^(5)`
D. 5.16 x `10^(6)`
